renewed jan



L. R. KELLEY.

SECURING RABBLE ARMS TO SHAFTS.

' APPLICATION FILED 0CT.13 I914- RENEWED JAN. 20,1916. 1 1 95 360 Patented Aug. 22, 1916.

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L. R. KELLEY.

SECURING RABBLE ARMS T0 SHAFTS.

APPLICATION FILED OCT. 13. 1914. RENEWED JAN. 20. I916.

Patented Aug. 22, 1916.

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L. R. KELLEY.

SECURING RABBLE ARMS T0 SHAFTS.

. APPLICATION FILED OCT. 13. I914- RENEWED IAN.20,1916. 1,195,3 0, Patented Aug. 22, 1916.

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L. R. KELLEY.

SECURING RABBLE ARMS T0 SHAFTS.

APPLICATION FILED OCT. 13. 19M. RENEWED lAN.-20, l9l6.

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WTED @TATE PATENT @FFIQE.

IIOUIS R KELLEY, 0F PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE FURNACE PATENT COMPANY, OF GREENWICH POINT, PHILADELPHIA, PENNSYLVANIA, A

CORPORATION OF PENNSYLVANIA.

Specification of Letters Patent.

Patented Au 22, 1916.

Application filed October 13, 1914, Serial No. 866,422. Renewed January 20, 1916. Serial No. 731180.

To all whom it may concern:

Be it known that I, Louis B. KnLLnY,a citizen of the United States, residing in Philadelphia, Pennsylvania, have invented certain Improvements in Securing Rabble- Arms to Shafts, of which the following is a specification.

This invention relates to means such as set forth in the Letters Patent No. 1,037,091, granted to Utley Wedge on the twentyseventh day of August, 1912, for securing rabble arms to the rotating shaft of a roasting furnace, the object of my invention being to provide for the application of the rabble arms to the shaft without the neces-' sity of entering the latter, if of large size, and also making possible and convenient the securing of the arms on the interior of the shaft even if said shaft is of such small diameter as to make it impossible for a workman to enter the same in order to operate directly upon the securing devices located within the shaft.

In the accompanying drawings Figure 1 is a side elevation of a rabble-arm-carrying shaft and rabble arms constructed in accordance with my invention; Fig. 2 is a view, partly in elevation and partly in vertical section, of the upper portion of said shaft and the uppermost pair of rabble arms thereon; Fig. 3 is a horizontal section on the line (ZCL, Fig. 2; Fig. i is a view, partly in side elevation and partly in section, on the line 12-71, Fig. 2, looking in the direction of the arrow as in said figure, and Fig. 5 is a View similar to Fig. 2, but illustrating a modification of my invention.

In the drawings, 1 represents the. central rotating tubular shaft of the furnace and 2 the rabble arms projecting therefrom and intended for the support of the rabbles whereby the material on the hearths of the furnace is stirred and agitated. The arms are, in the present instance, disposed in pairs, one pair for each of the working chambers of the furnace, the arms of each pair being disposed diametrically opposite one another, although this disposition of the arms is not important.

The structure shown in Fig. 1 is intended for a furnace having six chambers and six pairs of arms 2 which are disposed in different vertical planes so as to provide for the circumferential distribution of the operatingrods whereby the rabble arm securmg devices are operated, these rods being of different lengths, depending upon the vertical position of the arms with which they cooperate. Each arm 2 has a conical rib 3 which is adapted to seat in the outer face of a projecting boss 1 on the shaft, this boss, in the construction shown in Fig. 2, being hollow for the reception of a lever 5 hung upon a bolt 6 extending transversely through the boss and suitably secured thereto, said lever 5 swinging on the bolt and having a finger 7 which bears upon a shoulder 8 on the arm 2 and serves, when the long arm of the lever 5 is lifted, to press inwardly upon said shoulder and thereby force the conical rib 3 firmly against its seat in the boss l of the shaft. Pivotally connected to the long arm of the lever 5 is a rod 9 which passes through an opening in a flange 10 seated upon the flanged upper end of the shaft 1 and secured to or forming part of the upper member 1 of said shaft, which is reduced in diameter so as to provide a bearing upon the upper face of the flange 10 for a series of washers 11, one foreach'of the rods 9. The upper end of the rod 9 is threaded for the reception of a nut 12 and between the latter and the corresponding washer 11 is interposed a coiled spring 13, which serves to impart constant upward thrust to the rod 9 and thereby cause the finger 7 of the lever 5 to press constantly against the shoulder 8 on the rabble arm and thus hold the latter in proper position on the shaft irrespective of expansion and contraction due to varying temperatures. Within the shaft 1 is a pipe 14, whose upper end is screwed into the ring 15 carried by the upper end of said shaft 1, this pipe forming a continuation of the reduced upper portion 1 of the shaft and being provided at each pair of rabble arms with a ring 16 and laterally projecting branch pipes 17, the latter projecting into the rabble arms and serving to convey water or air thereto for cooling purposes, such cooling agent discharging from the inner ends of the rabble arms into the shaft 1, or the flow of cooling agent being the reverse of this, if desired.

'With the construction described the clamping or securing devices for the various rabble arms are all accessible from the outside of the shaft 1, and hence can be readily tightened or loosened irrespective of the diameter of the shaft.

In Fig. 5 I have illustrated a modification of my invention, in which, in place of the swinging clamping levers and the operating rods pivoted thereto,I have shown wedge bolts 18 rigidly guided on the inside of the shaft and hearing at their lower ends against wedge-shaped seats 19 on the rabble arms, rising and falling movement being imparted to these rods 18 by means of nuts 20 applied to the threaded upper ends of the rods and each contained in a recess between upper and lower bearings 21 and 22 on the upper section 1 of the shaft.

I claim: 7

1. The combination of the rabble-armcarrying shaft of a furnace with a projecting rabble arm whose inner end projects into the. shaft, arm-securing devices located on the inside of the shaft and engaging that portion of the rabble arm which projects into the shaft, and means whereby said securing devices are operable from the outside of the shaft.

:2. The combination of the rabble-armcarrying shaft of the furnace, a rabble arm projecting therefrom, a securing device therefor located on the inside of the shaft, and means for exerting a yielding pressure upon said securing device which tends to constantly tighten the same.

3. The combination of the rabble-armcarrying shaft, a projecting rabble arm seated thereon, and a tightening device for said arm having as elements a rod, a projection on the shaft through which said rod passes, and means above said projection for acting upon the rod to tighten the clamping device.

4. The combination of the rabble-armcarrying shaft, a rabble arm seated on and projecting therefrom, and a tightening device for said rabble arm having, as elements,

thereon, a'nut adapted to a threaded portion of the rod beyond said Washer, and a spring interposed between said nut andwa'sher.

, 6. The combination of the rabble-armcarrying shaft having a 'hollowboss thereon, a-rabble arm seated in said hollow boss, and a clamping device for said arm having a member pivotally mounted in said hollow boss. s

7. The combination of the rabble-armcarrying shaft having a hollow boss thereon,

a rabble arm seated in said hollow boss, a

clamping device for said arm having a member plvota'l'ly mounted in said hollow boss, another member connected to sa1d pivoted member, and operating means therefor on the outside of the shaft.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses. V

LOUIS 'R. KELLEY. Witnesses: V

CARL S. Foon, LESLIE H. WEBB.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of :Iatents,

' Washington, $0.0. 

